Hailey Weather in September

What's the weather like in Hailey (Idaho) in September 2025?

The climate in Hailey during September can be summarized as mild and dry.

September is in the fall / autumn in Hailey and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 21°C (69°F), whilst at night 1°C (34°F) is normal.

Hailey weather averages (imperial / metric)
Daytime temperature 20.6°C 69.1°F
Nightly temperature 1.2°C 34.2°F
Average temperature 10.9°C 51.6°F
Daily sunshine 10 hrs
Avg rainfall 24 mm 0.9 ins
Rainy days 7 days
Sea temperature 14.8°C 58.7°F
Humidity 50%
Windspeed 14.8kph 9 mph

On average September is the 2nd driest month of the year in Hailey with around 24mm 0.9 inches of rain making it a dry time to visit. This rainfall is typically spread over 7 days, although this may vary considerably.

On the flip side this corresponds to an average of 10 hours of sunshine per day.

September temperatures in Hailey

Hailey average temperature in September

September rainfall

Hailey average rain in September

September hourly sunshine

Hailey average rain in September

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Hailey in September 2025.

Other monthly averages

Best places to visit in September

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Hailey weather stats

Hailey weather statistics
Hottest month: July 26°C 78.8°F
Driest month: July 19mm 0.7ins
Sunniest month: July 12.7hrs
Coldest month: January -1.8°C 28.8°F
Wettest month: January 64mm 2.5ins
Map showing location of Hailey (43.51963, -114.31532) Hailey map pin © Google

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